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CHAPTER 13: PHASE REVERSAL AND PHASE IMBALANCE SET RELAYS
GE Industrial Systems 5300P Advanced Power Meter 79
CHAPTER 13
PHASE REVERSAL AND PHASE IMBALANCE SET LIMITS/RELAYS
13.1: Phase Reversal and Phase Imbalance
The set limit alerts the user of an unbalanced or a reversed phase in a Three-phase System. The EPM
5300P has two options for this purpose. The standard set-up is clockwise ABC rotation.
Counterclockwise CBA rotation can be selected in GROUP 03.1, Switch C UP.
PHASE REVERSAL: Activates when a reversed phase enters the EPM 5300P’s metering system.
PERCENT PHASE IMBALANCE: Activates when the user's preset value percent phase imbalance is
exceeded. For example: an unbalanced Three-phase System.
Note: The EPM 5200P does not have this capability.
FIGURE 13-1: EXAMPLE OF SET LIMITS
Limits Triggered
Limits Not Triggered
10%
10:00 AM 11:00 AM
PHASE IMBALANCE
(
%
)
THREE-PHASE SYSTEM IMBALANCE
13.2: Trip Relay
NOTE: All information pertaining to Trip Relays 1 and 2 applies only to a meter with the –NL option.
The unit has two relays linked through the program to LM1
and LM2 Set Limits. The relay outputs can be
programmed individually to close when LM1 and/or LM2 is triggered. Each relay has provisions for a
separate delay (see Chapter 12).
$TRIP RELAY 1
Whether to trip Relay 1.
%TRIP RELAY 2
Whether to trip Relay 2.
&LEVEL
The level at which the warning mechanism trips percentage of voltage imbalance.
'ENABLE/DISABLE
In the event of Phase Reversal, whether to enable or disable Phase Reversal
Detection.